[OpenACC][CIR] Implement 'modifier-list' lowering (#145770) Some of the 'data' clauses can have a 'modifier-list' which specifies one of a few keywords from a list. This patch adds support for lowering them following #144806. We have to keep a separate enum from MLIR, since we have to keep 'always' around for semantic reasons, whereas the dialect doesn't differentiate these. This patch ensures we get these right for the only applicable clause so far, which is 'copy'.
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